陕西勉略宁地区致矿地质异常场结构及找矿预测

陕西勉略宁“三角区”构造块体呈楔状夹持在秦岭微板块,扬子陆块和松潘甘孜褶皱带之间,目前已探讨明多种矿产,成矿作用 了自新太古代以来不同构造体抽下的多次构造,岩浆热事件和变质变形的复杂的地质作用,使致矿地质异常场结构复杂化。

STRUCTURAL ANALYSIS OF ORE-GENERATING GEOLOGICAL ANOMALY FIELD AND FORECASTING OF ORE PROSPECTING, MIAN-LUE-NING REGION, SHAANXI PROVINCE, CHINA

The structural mass in the "triangular area", Mian-Lue-Ning region, Shaanxi Province, is wedged in between the Qinling microplate,the Yangtze landmass, and the Songpanganzi fold zone. In this mass, several mineral resources have been proved.Since the Neoarchean,the mineralization has undergone several structural and magmatic events,and metamorphic deformations and complex geological activities in different tectonic systems,resulting in the complexity of the ore-generating geological anomaly field structure.The TM remote-sensing linear and circular structures interpreted up to date,well developed,can be classified as four groups in terms of the strkes.The linear and circular structures in different distributions and combinations have produced distinctive different controlling effects on the distributions of the mineral deposts (sites).The anomaly associations between the positive and negative aeromagnetic fields,steep in the north and slow in the south,characterize the aeromagnetic fields,distributed in three directions.The majority of copper and gold deposits(sites) are distributed in the gradient zone of the positive and negative aeromagnetic anomalies.The sharp distinction of the geochemical anomaly association that varies with different positions of the structural-stratigraphic combinations may serve as an important basis for the location of different types of mineral deposits.The indicator for the combination between ore-generating stratigraphic-structural-physical-chemical fields and the forecasting model favorable for the ore-finding established with the known mineral deposit values of the ore-bearing unit can both be used to make a new round of the classification of the prospect area and to locate 10 best prospecting targets.